feat(file-summary): 生成汇总报告和导出下载

review_agent/file_summary/views.py

@@ -1,8 +1,10 @@
 from django.contrib.auth.decorators import login_required
-from django.http import Http404, JsonResponse
+from pathlib import Path
+
+from django.http import FileResponse, Http404, JsonResponse
 from django.views.decorators.http import require_http_methods
 
-from review_agent.models import Conversation, FileAttachment
+from review_agent.models import Conversation, ExportedSummaryFile, FileAttachment
 from review_agent.models import FileSummaryBatch, WorkflowEvent
 from .events import serialize_event
 
@@ -105,3 +107,18 @@ def batch_events(request, batch_id: int):
         after_id = 0
     events = WorkflowEvent.objects.filter(batch=batch, pk__gt=after_id).order_by("id")
     return JsonResponse({"events": [serialize_event(event) for event in events]})
+
+
+@require_http_methods(["GET"])
+@login_required
+def export_download(request, export_id: int):
+    exported = ExportedSummaryFile.objects.filter(
+        pk=export_id,
+        batch__user=request.user,
+    ).first()
+    if not exported:
+        raise Http404("导出文件不存在。")
+    path = Path(exported.storage_path)
+    if not path.exists():
+        return JsonResponse({"error": "文件不存在。"}, status=404)
+    return FileResponse(path.open("rb"), as_attachment=True, filename=exported.file_name)